Integrated dual-drive control diaphragm valve

Abstract

The invention discloses an integrated dual-drive controlled diaphragm valve, which belongs to the technical field of diaphragm valves, and comprises a valve seat and a control head, the valve seat is in threaded connection with a valve seat cover, a connecting block is mounted in the valve seat cover, stepped holes are formed in the connecting block, a connecting block step is formed between the stepped holes, and a diaphragm pressing block is mounted in the stepped hole; the diaphragm pressing block can abut against the step of the connecting block for limiting, and the control head is detachably connected with the connecting block. According to the integrated dual-drive controlled diaphragm valve, the connecting block step is arranged in the connecting block, so that the diaphragm pressing block can abut against and be limited, and therefore, under the condition that the valve is opened, even if the control head is detached, the diaphragm pressing block cannot be separated from the diaphragm, the diaphragm cannot be excessively deformed and damaged, pipeline leakage is prevented, and the service life of the valve is prolonged. Therefore, the control head can be maintained with gas, the control mode can be replaced by replacing the control head on the basis that the valve is not disassembled, the valve replacement time and the pipeline exhaust time are saved, and the time and labor cost are reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of diaphragm valves, and in particular relates to an integrated dual-drive controlled diaphragm valve. Background Art

[0002] Diaphragm valves are divided into two types: manual control and pneumatic control. Manual control can be divided into lockable or non-lockable structures, and pneumatic control can be divided into normally open pneumatic and normally closed pneumatic. In conventional pipeline systems, it is sometimes necessary to replace pneumatic control valves with manual control valves. The existing method can only remove the entire valve from the pipeline system for replacement. Since the replacement of the valve requires the removal and protection of all the residual gas in the pipeline system, and then replace the required valve according to the actual situation, in this process, the removal of gas, maintenance and purging of the pipeline are time-consuming, labor costs are high, and the value loss caused is immeasurable. Therefore, in order to avoid direct losses under this working condition, a structure of a diaphragm valve with gas in the pipeline that can be repaired has been developed. The process of changing from a manual diaphragm valve to a pneumatic diaphragm valve with gas does not require the removal of the valve, and this series of operations can be completed on the pipeline system. Summary of the invention

[0003] The purpose of the present invention is to solve the problem that when the existing pipeline system needs to replace the valve, the entire valve needs to be disassembled, which causes a long time, high labor cost and great value loss. An integrated dual-drive controlled diaphragm valve is proposed, which can be used for air maintenance of the diaphragm valve, and can also replace the manual diaphragm valve with a pneumatic diaphragm valve with air without disassembling the valve, thereby saving the time for valve replacement and pipeline venting, and reducing time and labor costs.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions: A diaphragm valve with integrated dual-drive control comprises a valve seat and a control head, a valve seat is threadedly connected to a valve seat cover, a valve seat cover cavity is provided in the valve seat cover, a valve seat cover opening is provided at a sealing end of the valve seat cover, the valve seat cover opening is communicated with the valve seat cover cavity, and a valve seat cover step is formed between the valve seat cover opening and the valve seat cover cavity, a connecting block is installed in the valve seat cover, the end of the first end of the connecting block has an outward flange, the flange of the connecting block is clamped between the end of the valve seat and the valve seat cover step, the second end of the connecting block extends from the valve seat cover opening to become an exposed end, and the control head is detachably connected to the exposed end of the connecting block; a step hole is provided in the connecting block, the step hole comprises a large hole and a small hole arranged coaxially, a connecting block step is formed between the large hole and the small hole, a diaphragm pressing block is installed in the large hole, and the diaphragm pressing block can abut against the connecting block step to limit the position.

[0005] As a further description of the above technical solution, the diaphragm pressing block is in an I-shape, and a sealing ring is provided between the diaphragm pressing block and the inner wall of the connecting block, which together with the diaphragm prevents air leakage from the valve body.

[0006] As a further description of the above technical solution, the first end of the connecting block is recessed inward to form an arc-shaped cavity, a diaphragm is arranged in the arc-shaped cavity, and the diaphragm pressing block is pressed on the diaphragm.

[0007] As a further description of the above technical solution, the valve seat is provided with a liquid inlet hole and a liquid outlet hole, the liquid inlet hole and the liquid outlet hole are connected through a fluid channel, the edge of the diaphragm is fixed on the fluid channel, and the center of the diaphragm covers the outlet of the liquid inlet port, which is used to open or close the fluid channel.

[0008] As an embodiment of the present invention, the control head is a pneumatic head, which is threadedly connected to the exposed end of the connecting block. A piston is installed in the cavity of the pneumatic head. The piston rod of the piston extends from the pneumatic head and can pass through the small hole of the connecting block to abut against the diaphragm pressure block.

[0009] As another embodiment of the present invention, the control head is a manual control knob, which is threadedly connected to the exposed end of the connecting block. A control rod is provided on the manual control knob, which can pass through the small hole of the connecting block and abut against the diaphragm pressing block.

[0010] Compared with the prior art, the present invention has the following beneficial effects: The integrated dual-drive controlled diaphragm valve of the present invention is provided with a step hole in the connecting block, and the diaphragm pressing block is located in the large hole of the step hole and can be abutted against the step of the connecting block for limiting position. Under the pneumatic control state, air is inflated into the pneumatic head, and the gas pushes the piston to drive the piston rod to move. The pressure applied by the piston rod to the diaphragm pressing block gradually decreases or even stops applying pressure. At this time, under the impact of the pipeline gas (or fluid), the diaphragm is deformed and convex, and the diaphragm pressing block is lifted up to abut against the step of the connecting block, the fluid channel is opened, and the valve is opened. Since the diaphragm pressing block is limited by the step of the connecting block, it will not separate from the diaphragm, so that the diaphragm will not be excessively deformed, and the edge of the diaphragm still covers the fluid channel. Even if the control head is disassembled, the valve will not leak. If it needs to be replaced with manual control, it only needs to remove the pneumatic head and then install the manual control knob. The change from pneumatic control to manual control can be achieved without closing the valve, and there is no need to disassemble the entire diaphragm valve for replacement; the same is true for converting manual control to pneumatic control.

[0011] The control head and valve seat of the integrated dual-drive controlled diaphragm valve of the present invention are detachably connected, so the control head can be repaired separately without replacing the diaphragm valve as a whole, thus saving maintenance costs; the pneumatic control and manual control can also be replaced when the valve is open, without closing the valve and discharging the pipeline gas, thus saving time and effort; a valve seat is equipped with a control head with two control modes, which can have both pneumatic and manual control modes, thus saving manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1is a cross-sectional view of the integrated dual-drive controlled diaphragm valve of the present invention; Figure 2 is a cross-sectional view of the valve seat of the present invention; Figure 3 is a cross-sectional view of the valve seat cover of the present invention; Figure 4 is a cross-sectional view of a connector of the present invention; Figure 5 It is a stereogram of the manual control knob of the present invention.

[0013] Legend: 1-valve seat; 11-liquid inlet hole; 12-liquid outlet hole; 13-fluid channel; 2-valve seat cover; 21-valve seat cover cavity; 22-valve seat cover opening; 23-valve seat cover step; 3-diaphragm; 4-diaphragm pressure block; 41-sealing ring; 5-connecting block; 51-flange; 52-exposed end; 53-large hole; 54-connecting block step; 55-small hole; 56-arc cavity; 6-pneumatic head; 61-piston; 611-piston rod; 7-manual control knob; 71-pressure rod. DETAILED DESCRIPTION

[0014] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0015] This embodiment provides an integrated dual-drive controlled diaphragm valve, such as Figure 1 — Figure 5As shown, it includes a valve seat 1 and a control head, wherein a liquid inlet pipe hole 11 and a liquid outlet pipe hole 12 are provided in the valve seat 1, and the liquid inlet pipe hole 11 and the liquid outlet pipe hole 12 are communicated with each other through a fluid channel 13, and a valve seat cover 2 is threadedly connected to the valve seat 1, and a valve seat cover cavity 21 is provided in the valve seat cover 2, and a valve seat cover opening 22 is opened at the sealing end of the valve seat cover 2, and the valve seat cover opening 22 is communicated with the valve seat cover cavity 21, and a valve seat cover step 23 is formed between the valve seat cover opening 22 and the valve seat cover cavity 21, and a connecting block 5 is installed in the valve seat cover 2, and the end of the first end of the connecting block 5 has an outward flange 51, and the flange 51 of the connecting block 5 is clamped and limited between the end of the valve seat 1 and the valve seat cover step 23, and the second end of the connecting block 5 extends out of the valve seat cover opening 22 to become an exposed end 52, and the control head is detachably connected to the exposed end 52 of the connecting block 5, and a threaded connection can be adopted for easy disassembly and replacement. A step hole is provided in the connecting block 5, and the step hole includes a large hole 53 and a small hole 55 which are coaxially arranged. A connecting block step 54 is formed between the large hole 53 and the small hole 55. A diaphragm pressing block 4 is installed in the large hole 53, and the diaphragm pressing block 4 can abut against the connecting block step 54 for limiting. The first end of the connecting block 5 is recessed inward to form an arc cavity 56, and the arc cavity 56 corresponds to the fluid channel 13. A diaphragm 3 is provided in the arc cavity 56, and the edge of the diaphragm 3 is located at the edge of the fluid channel 13. The center of the diaphragm 3 covers the outlet of the liquid inlet pipe hole 11. When the diaphragm 3 tightly covers the outlet of the liquid inlet pipe hole 11, the liquid inlet pipe hole 11 is not connected with the liquid outlet pipe hole 12, and the valve is closed; when the diaphragm is impacted by the gas (or fluid) in the pipeline and deforms and bulges, the diaphragm 3 is separated from the liquid inlet pipe hole 11, and the gas (or fluid) in the liquid inlet pipe hole 11 enters the liquid outlet pipe hole 12 through the fluid channel 13, and the valve is opened. The diaphragm pressing block 4 is pressed on the diaphragm 3, and the diaphragm pressing block 4 is in an I-shape. A sealing ring 41 is provided between the diaphragm pressing block 4 and the inner wall of the connecting block 5. The gas (or fluid) in the pipeline is doubly sealed by the diaphragm 3 and the sealing ring 41 to prevent valve leakage.

[0016] The integrated dual-drive controlled diaphragm valve of the present invention can select the type of control head according to actual needs. If pneumatic control is required, the pneumatic head 6 is selected; if manual control is required, the manual control knob 7 is selected. The pneumatic head 6 is threadedly connected to the exposed end 52 of the connecting block 5. A spring and a piston 61 are installed in the cavity of the pneumatic head 6. The piston rod 611 of the piston 61 extends from the pneumatic head 6 and can pass through the small hole 55 of the connecting block 5 to abut against the diaphragm pressing block 4; the manual control knob 7 is threadedly connected to the exposed end 52 of the connecting block 5, and a pressure rod 71 is provided on the manual control knob 7. The pressure rod 71 can pass through the small hole 55 of the connecting block 5 and abut against the diaphragm pressing block 4.

[0017] The integrated dual-drive controlled diaphragm valve of the present invention can also switch the driving mode according to the actual working conditions without closing the valve and with gas: when the pneumatic control is switched to manual control, the pneumatic head 6 is inflated, and the piston rod 611 is driven by the piston 61 to move away from the diaphragm pressing block 4, and the diaphragm 3 is deformed and convex under the impact of the pipeline gas (or fluid), and the valve is opened. At this time, the diaphragm pressing block 4 is abutted against the connecting block step 54 to limit the deformation of the diaphragm 3 on the one hand, so that the valve flow is constant, and on the other hand, it also prevents the diaphragm 3 from being damaged by excessive impact force. At this time, the pneumatic head 6 can be disassembled and replaced with a manual control knob 7, and when the diaphragm pressing block 4 is limited, the valve is still in an open state, and under the double sealing of the diaphragm 3 and the sealing ring 41, pipeline leakage can still be prevented; the same is true when the manual control is switched to the pneumatic control, that is, without disassembling and replacing the entire diaphragm valve, the purpose of changing from pneumatic control to manual control or from manual control to pneumatic control with gas is achieved, saving manufacturing and time costs.

[0018] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. A person skilled in the art should understand that the technical solutions described in the above embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the present invention.

Claims

1. An integrated dual-drive controlled diaphragm valve, comprising a valve seat (1) and a control head, characterized in that: A valve seat cover (2) is threadedly connected to the valve seat (1), and a valve seat cover cavity (21) is provided in the valve seat cover (2). A valve seat cover opening (22) is provided at the sealing end of the valve seat cover (2), and the valve seat cover opening (22) is communicated with the valve seat cover cavity (21), and a valve seat cover step (23) is formed between the valve seat cover opening (22) and the valve seat cover cavity (21). A connecting block (5) is installed in the valve seat cover (2), and the end of the first end of the connecting block (5) has an outward flange (51), and the flange (51) of the connecting block (5) is clamped between the end of the valve seat (1) and the valve seat. The second end of the connecting block (5) extends out from the valve seat cover opening (22) to become an exposed end (52), and the control head is detachably connected to the exposed end (52) of the connecting block (5); a step hole is opened in the connecting block (5), and the step hole includes a large hole (53) and a small hole (55) arranged coaxially, and a connecting block step (54) is formed between the large hole (53) and the small hole (55); a diaphragm pressing block (4) is installed in the large hole (53), and the diaphragm pressing block (4) can abut against the connecting block step (54) to limit the position.

2. The integrated dual-drive controlled diaphragm valve according to claim 1, characterized in that: The diaphragm pressing block (4) is in an I-shape, and a sealing ring (41) is provided between the diaphragm pressing block (4) and the inner wall of the connecting block (5).

3. The integrated dual-drive controlled diaphragm valve according to claim 2, characterized in that: The first end of the connecting block (5) is recessed inwards to form an arc-shaped cavity (56), a diaphragm (3) is arranged in the arc-shaped cavity (56), and the diaphragm pressing block (4) is pressed on the diaphragm (3).

4. The integrated dual-drive controlled diaphragm valve according to claim 3, characterized in that: The valve seat (1) is provided with a liquid inlet pipe hole (11) and a liquid outlet pipe hole (12), the liquid inlet pipe hole (11) and the liquid outlet pipe hole (12) are connected via a fluid channel (13), the edge of the diaphragm (3) is fixed on the fluid channel (13), and the center of the diaphragm (3) covers the outlet of the liquid inlet pipe port (11), so as to open or close the fluid channel (13).

5. The integrated dual-drive controlled diaphragm valve according to any one of claims 1 to 4, characterized in that: The control head is a pneumatic head (6), a piston (61) is installed in the cavity of the pneumatic head (6), and a piston rod (611) of the piston (61) extends from the pneumatic head (6) and can pass through the small hole (55) of the connecting block (5) to abut against the diaphragm pressing block (4).

6. The integrated dual-drive controlled diaphragm valve according to any one of claims 1 to 4, characterized in that: The control head is a manual control knob (7), and a pressure rod (71) is provided on the manual control knob (7). The pressure rod (71) can pass through the small hole (55) of the connecting block (5) and abut against the diaphragm pressure block (4).

7. The integrated dual-drive controlled diaphragm valve according to claim 5, characterized in that: The pneumatic head (6) is threadedly connected to the exposed end (52) of the connecting block (5).

8. The integrated dual-drive controlled diaphragm valve according to claim 6, characterized in that: The manual control knob (7) is threadedly connected to the exposed end (52) of the connection block (5).

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